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							Sum of the First 'n' Natural Numbers
								Certification: Basic Level
								Accuracy: 83.33%
								Submissions: 6
								Points: 5
							
							Write a C++ program that calculates the sum of the first 'n' natural numbers.
Example 1
- Input: n = 5
 - Output: 15
 - Explanation: 
- Step 1: Identify the first n natural numbers: 1, 2, 3, 4, 5.
 - Step 2: Calculate the sum: 1 + 2 + 3 + 4 + 5 = 15.
 - Step 3: Return the sum: 15.
 
 
Example 2
- Input: n = 10
 - Output: 55
 - Explanation: 
- Step 1: Identify the first n natural numbers: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10.
 - Step 2: Calculate the sum: 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 = 55.
 - Step 3: Return the sum: 55.
 
 
Constraints
- 1 ≤ n ≤ 10^6
 - Note: You can use the mathematical formula: sum of first n natural numbers = n(n+1)/2
 - Time Complexity: O(1) when using the formula
 - Space Complexity: O(1)
 
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Solution Hints
- Use the formula: n * (n + 1) / 2
 - Handle edge case where n = 1 explicitly
 - Ensure calculations avoid integer overflow